Ray-type spectra of plasma turbulence in coronal magnetic loops

Details Ray-type spectra of plasma turbulence in coronal magnetic loops Ray-type spectra of plasma turbulence in coronal magnetic loops

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..136..117r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 136, Nov. 1991, p. 117-132.

Physics

1

Coronal Loops, Electromagnetic Radiation, Plasma Turbulence, Radio Bursts, Solar Spectra, Type 4 Bursts, Energetic Particles, Radio Emission, Wave Excitation

Scientific paper

The present study considers the problem of stationary spectra of Langmuir, l, and electromagnetic, t, waves excited in a magnetic trap (loop) by a group of suprathermal electrons, whose velocity distribution includes a 'loss cone.' Accurate spectra of l- and t-waves are found within the framework of weak turbulence theory. These spectra have the form of thin rays in wavevector space. Forms of plasma emission radio lines of a homogeneous source near the plasma frequency and its second harmonic are determined. Solutions are obtained for spectra of Langmuir and electromagnetic waves that differ from those reported earlier not only quantitatively but also qualitatively: the emission directions near the plasma frequency and its second harmonic are different.

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